nrf54l: Allow debug access from firmware side

[Tiwalun]

This unlocks debugger access to the application core, if it is also unlocked in UICR.

[Dirbaio]

this is quite verbose. I see you did it this way to reuse the values across dbgen, niden, spiden but it ends up being more verbose and nothing enforces the bits for these are at the same position. i'd suggest using the plain old closure write instead:

use crate::pac::tampc::vals;

p.protect().domain(0).niden().ctrl().write(|w| {
    w.set_key(vals::DomainDbgenCtrlKey::KEY);
    w.set_writeprotection(vals::DomainDbgenCtrlWriteprotection::CLEAR);
});

[Dirbaio]

thank!